Older Halpha diagonal tuner

[rcwinter]

Can anyone remember the early Coronado Solar scope which had tuning done By a small steel knurled knob on the diagonal ?

Anybody remember these and which model it was ?

Thanks in advance

Richard

[Bob Yoesle]

The tilt-tuned blocking filters were from the Isle of Man Coronado days. The model you're referring to is the Prom 15 T:

Prom 15T side.jpg (129.96 KiB) Viewed 254 times

Prom 15T back.jpg (90.18 KiB) Viewed 254 times

The was also the tilting BF30:

IOM BF30.jpg (197.64 KiB) Viewed 254 times

[EGRAY_OBSERVATORY]

Those were the days and for a small Island in the Irish Sea, a tribute to the manufacturer.

Terry

[DeepSolar64]

Isle of Man Coronado. I do remember reading somewhere that David Lunt ( Coronado ) and the founder of Solarscope were collaborators/partners at one time and parted ways. I can't remember where I came across that. And of course Andy Lunt ( Lunt Solar Systems ) is David's son so all three to some extent have a shared history. All three companies are still around. Coronado and Solarscope no longer under their original owners but Lunt still is.

And then there is DayStar filters. No connection to David Lunt to my knowledge. They may be the oldest of all concerning amateur Ha. But they too are no longer under their founding owner.

I bet those tunable blocking filters were really pricey on those days.